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President Lincoln and HR2600


ALIGNMENT PROCEDURE


PLL and CARRIER OSCILLATOR PORTION


Test equipment required:
Power Supply: 13,8 VOscilloscopeFrequency CounterDC Voltmeter

Preparation alignment:
PA SWOff
RITMiddle position
ModeAM
Frequency28.000 MHz

StepConditionAdjustmentProcedure
1AM
RX
L315Connect the Oscilloscope and Frequency Counter to TP306. Adjust for 6.200 MHz +/- 20 Hz
2AM
RX
L318Connect the Oscilloscope and Frequency Counter to TP304. Adjust for 38.6950 MHz +/- 20 Hz.
Check:
USB : 38.6975MHz
LSB : 38.6925MHz
3AM
RX
L317Connect the DC Voltmeter to TP 303. Adjust for 6.5 V +/- 0.1 V
4CW
RX
L117Connect the Oscilloscope and Frequency Counter to TP1. Adjust for 10.695 MHz +/- 20 Hz
5LSB
RX
L118Connect the Oscilloscope and Frequency Counter to TP1. Adjust for 10.6925 MHz -40 Hz to + 0 Hz
6USB
RX
L116Connect the Oscilloscope and Frequency Counter to TP1. Adjust for 10.6975 +/- 20 Hz
7USB
RX
VR111Connect the Oscilloscope and Frequency Counter to TP5. Adjust for 38.6975 +/- 20 Hz

AdjustmentDescription
VR304Amplifier Gain Adjustment
Only in President HR2600

Adjustment of Balanced Mixer`s

AdjustmentDescription
VR301DC Balance Adjustment for Balanced Mixer
L3039-10MHz Signal Balance Adjustment to Mixer
L30414-18MHz Signal Balance Adjustment to Mixer
Connect Oscilloscope to IC304 pin 2.
Adjust VR301 for correct DC-balance.
Adjust L303 for maximum signal.
Adjust L304 for maximum signal.

AdjustmentDescription
VR302DC Balance Adjustment for Balanced Mixer
L31322MHz Signal Balance Adjustment to Mixer
L31436-40MHz Signal Balance Adjustment to Mixer
Connect Oscilloscope to IC305 pin 2.
Adjust VR302 for correct DC-balance.
Adjust L313 for maximum signal.
Adjust L314 for maximum signal.

BandPassFilter Adjustment

AdjustmentDescription
L310High Band Adjustment
L319Low Band Adjustment
Connect Oscilloscope to Output Terminal for VCO.
Adjust L310 for maximum at 29.000MHz.
Adjust L319 for maximum at 28.500MHz.

BandFrequency Range (Without ChipSwitch or Frequency Modification)
A28.000 to 28.4999 MHz
B28.500 to 28.999 MHz
C29.000 to 29.4999 MHz
D29.5000 to 29.699 MHz

Output Frequency from PLL-PCB to Analog-PCB

Fvco = F + 10.6950MHz + a
F = Transmitting and Receiving frequency
Fvco = VCO Output frequency
a = 0kHz for CW/FM/AM
a = +2.5kHz for USB
a = -2.5kHz for LSB

Block Diagram

PCB